I don't think there was any remaining inventory; they had a hard time filling all the outstanding orders when they closed down. Dakota arms bought the assets, but could not get permission from Ithaca to use the name. The number produced was around 275, but I don't know how many were 20s and how many 28s. Gunther Pfrommer would probably be able to answer these questions. I bought an ICD trade label from him a few years ago for a hard case and he seemed very knowledgeable (he worked for the company).
Joe